Node.js operates mysql database to add, delete, modify and query_node.js

Please read the full text for an introduction to node.js operating mysql database. The following introduction is very detailed, and the specific content is as follows:

Install mysql module

npm install mysql 

Database preparation

The IP address of the machine where mysql server is located is 192.168.0.108. To log in, use root@123456

Create test database in mysql

Create a users table in the test database

Operation

Connect to database

var mysql=require('mysql');
var connection = mysql.createConnection({
host : '192.168.0.108',
user : 'root',
password : '123456',
database : 'test1',
port:'3306'
});
connection.connect();

Insert a user

var usr={name:'zhangsan',password:'pwdzhangsan',mail:'zhangsan@gmail.com'};
connection.query('insert into users set ?', usr, function(err, result) {
if (err) throw err;
console.log('inserted zhangsan');
console.log(result);
console.log('\n');
});

Update user with conditions

connection.query('update users set password="ddd" where name="zhangsan"', {password:'ppp'}, function(err, result) {
if (err) throw err;
console.log('updated zhangsan\'s password to ddd');
console.log(result);
console.log('\n');
}); 

Delete a user with conditions

connection.query('delete from users where name="zhangsan"', {password:'ppp'}, function(err, result) {
if (err) throw err;
console.log('deleted zhangsan');
console.log(result);
console.log('\n');
});

Query user, all

connection.query('select * from users', function(err, rows, fields) {
if (err) throw err;
console.log('selected after deleted');
for(var i= 0,usr;usr=rows[i++];){
console.log('user nae='+usr.name + ', password='+usr.password);
}
console.log('\n');
}); 

Close database connection

connection.end();

Basic CRUD completion

For the complete function description of the mysql module, please see the official:

https://www.npmjs.com/package/mysql

https://github.com/felixge/node-mysql

All demo codes

var mysql=require('mysql');
var connection = mysql.createConnection({
host : '192.168.0.108',
user : 'root',
password : '123456',
database : 'test1',
port:'3306'
});
connection.connect();
var usr={name:'zhangsan',password:'pwdzhangsan',mail:'zhangsan@gmail.com'};
connection.query('insert into users set ?', usr, function(err, result) {
if (err) throw err;
console.log('inserted zhangsan');
console.log(result);
console.log('\n');
});
connection.query('select * from users', function(err, rows, fields) {
if (err) throw err;
console.log('selected after inserted');
for(var i= 0,usr;usr=rows[i++];){
console.log('user nae='+usr.name + ', password='+usr.password);
}
console.log('\n');
});
connection.query('update users set password="ddd" where name="zhangsan"', {password:'ppp'}, function(err, result) {
if (err) throw err;
console.log('updated zhangsan\'s password to ddd');
console.log(result);
console.log('\n');
});
connection.query('select * from users', function(err, rows, fields) {
if (err) throw err;
console.log('selected after updated');
for(var i= 0,usr;usr=rows[i++];){
console.log('user nae='+usr.name + ', password='+usr.password);
}
console.log('\n');
});
connection.query('delete from users where name="zhangsan"', {password:'ppp'}, function(err, result) {
if (err) throw err;
console.log('deleted zhangsan');
console.log(result);
console.log('\n');
});
connection.query('select * from users', function(err, rows, fields) {
if (err) throw err;
console.log('selected after deleted');
for(var i= 0,usr;usr=rows[i++];){
console.log('user nae='+usr.name + ', password='+usr.password);
}
console.log('\n');
});
connection.end();